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- Olson, Storrs L. 1944-2021 441 downloads
- Opie, John 1761-1807 441 downloads
- Ainslie, Arthur 1870-1940 440 downloads
- Orbigny, Alcide Dessalines d' 1802-1857 440 downloads
- Jón Ólafsson 1850-1916 440 downloads
- Fielding, Robert O. - 440 downloads
- O'Keefe, John - 439 downloads
- Cummins, Harle Oren 1859-1931 439 downloads
- Ott, Charles J. - 438 downloads
- Wildermuth, Ottilie 1817-1877 438 downloads
- Grosch, Oscar Edward 1863-1928 438 downloads
- Murie, Olaus J. (Olaus Johan) 1889-1963 438 downloads
- Gregory, Owen - 437 downloads
- O'Brien, Nora Connolly 1893-1981 436 downloads
- Elton, Letitia MacColl 1865-1947 436 downloads
- Association of Official Agricultural Chemists (U.S.) - 436 downloads
- Pickard-Cambridge, Octavius 1828-1917 435 downloads
- Dornblüth, Otto 1860-1922 435 downloads
- Lippmann, Edmund O. von (Edmund Oskar) 1857-1940 435 downloads
- Davis, Calvin Olin 1871-1954 435 downloads
- Johnson, S. O. (Sophia Orne) 1826-1899 435 downloads
- Lashin, Orrie - 434 downloads
- Owen, Derwyn Trevor 1876-1947 434 downloads
- Ornsby, Robert 1820-1889 433 downloads
- National Association for the Advancement of Colored People - 433 downloads